常用正则

去除字符串空格

var str = ' qdleader like u';

console.log(str.replace(/\s/ig,''))

身份证号码

 var Card = /^(^[1-9]\d{7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}$)|(^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])((\d{4})|\d{3}[Xx])$)$/;

手机号

 let phone = /^[1][3,4,5,7,8][0-9]{9}$/;

手写trim

String.prototype.trim = function () {
  return this.replace(/^\s+/,'').replace(/\s+$/,'')
}

去除富文本

let data =document.getElementById(aa).innerHTML;
data = data.replace(/(\n)/g, "");    
data = data.replace(/(\t)/g, "");    
data = data.replace(/(\r)/g, "");    
data = data.replace(/<\/?[^>]*>/g, "");    
data = data.replace(/\s*/g, "");

将html标签替换为空字符串

str.replace(/(<(.[^>]*)>)|(&nbsp;)/g,"")